Car truck



G. A. ANDERSON.

CAR muck. MPLICATION FILED MN. I9, |9211- Patente May 2,1922. l

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SYMINGTON COMIANY, OF 'NEW "YOK,

N. Y., Ai COELPORATON 0F DELAARE.

GAR TRUCK.

Specification. of Letters Patent.

Patented M-ay 2,1922.

Vlipplica'tion filed January 19,1921. Serial yNo. 438,417?.

To all whom t may concern Be it known that I, GU'sTAr Anvil) ArmensoN, a citizen ofthe UnitedStates, residing at Baltimore, inthe State-ot Maryland, have invented certain new land useful Improve-- ments in Car Trucks; and l dol'i'ereby declare the tollowingto Vbe a tull,clear, and exact description'ofthe invention, such as will enable others skilled in the art to which it a-ppertainslto make and` use the same.

My invention relates toflexible car trucks whose side 'trames are connected in a manner permitting them tobe capable of suffcient relative movement longitudinally of t-he truck to relieve the truck parts trom the distorting and destructive eifects of 'extraneous forces applied to the'truck as'aresult of its passage aroiind curves or vover bad railjoints or by 'coming 'in contact with projecting switch points/or because of inequalities in theltruclrwheels.` V

Generally stated, the principal object of my invention is to provide a iieXible cartruck in which 'the side frames, while connected transversely'of the truck 'by means permitting them to have'the' desired range of longitudinal displacement, 'are opposedand'cnshtioned in'such displacement by la yieldingr resstance which 'normally 'maintains or tends to Vmaintain them in square relation, said vmechanism operating to restore the 'side trame members to square relation when the `extraneous -force causing their l'longitudinal displacement vceases to act. vMore, specically,the 'yielding means for controlling the relative 'longitudinal movements -ot the side 'trames is preferably designed to Lbe ot a n'atiir'e affording avcompar'atively low initial resistance to the vdisplacement of the side trames but to have a-changing rate of resistance'so that-the cushioning' force toward l* the end oi an extreme displacement ot the side ytrames is relatively high. By't-liiis op- 'posi-ng the displacement of .the side frames withyielding means Vvvh'o'se resistance is not directly proportional to vthe eXtent foic their relative displacement, the side `frame memi Jbers are permitted readily yto yield longitudinally oi'thetriiclr when the lattervis 'pass ing around a curve, while Vafhigh cushioning lresistance is afforded for the pi'ii'fpose 'of rel'ievinig the truck parts from abnormall'ysevere strains to which they lare at times siibvjec'ted because of the imperfect condition of lthe traclcf` vlllig,

truck parts being illiistirated iii a v`position -which they would assume inpassing aroiifnd 'a curve.

p Figure 2 is a detail section oiiHtlielinefQQQ,

l, thep-arts being in'theirlnorinal'relation.

ln Ithe drawings, l indicates A"tiaiisversely spaced side'i'ramemembers eachfof which is provided at its opposite ends 'with joiirnal 'boxes 2 receiving the' journal ends 'of 'the axles B by which the 'truck r`wheels 4 are carried,

The side `frame members "l are Infvably lconnected by a cross connecting means 5 which is preferably in 'the y'form'of achanneled springplank having'itsilang'es ex'tending upwardly. The 'opposite 'ends of' the cross connecting member5preiterably entend I'into the corresponding bolster openings 6 of the respective side trame members, sufficient clearance being allowed between the member 5 and the neighboring :faces vof the' 'truck' column 7 to allow thecross connectingy means 'to turn lthroughra comparatively large angle with. `respect vto the side frames l so 'as to permit the'latter to shift longitudinally of the 'truck in either direction troi'nrtheir nor'- mal or square position. The bolster (not shown) also 'extends `into `thefbolster openings '6 lbetween the columns7 of the side iFrames and, as is usual, is designed "to be capable of shiftingits angular' relation 'with respect 'to the vside frames "1 yi'vhlen the 'latter are displaced klongitudinally oft fthe truck. The cross coniiecting"ineens: or spring plank 5 is movably connected `to` the` side frames, siich connection preferably beii'geffected by lproviding each side 'frame centrally of its bolster opening with 'an upwardly projecting pivot boss 8 which enters a correspondingly 'formed pivot aperture 9 in the spring pla-nk.

Q Laie-,eis

The spring means employed for resistingrelative longitudinal displacement of the side frames l from normal position is designed to oppose such displacement at an increasing rate of resistance, the initial resistance being preferably low and progressively increasing until at the end of the eXtreme displacement of the side frames it is comparatively high. A plurality of leaf spring means 10 may be and preferably are employed to effect such a yielding resistance. Each spring means 10 preferably comprises a series of leaves which are riveted or otherwise rigidly secured at their inner ends to the cross connecting means 1n case a spring plank7 such 5, is employed the spring means 10 are preferably secured to the opposite sides thereof by attaching them to the flanges 11. Fillers or thrust blocks 12 may be interposed between the inner ends of adjacent spring means 10 to support the flanges 1l of the spring plank against bending strains. rllhe outer ends of the spring means 10 normally engage the respective frame members l so as to eX- ert pressure upon the inner side of each frame on opposite sides of its pivotal connection with the spring plank. By this means the side frame members l are yieldingly maintained in normal or square relation perpendicular to the spring plank 5. A departure longitudinally of the truck of either side frame member 1 from its normal position causes a change in the angular relation of the side frame to the spring plank 5 and therefore effects anenergizing deflection of one or the other of the spring means 10 adjacent the side frame dependent upon the direction of movement of the latter.

` The resistance aorded by the leaf spring means 10 to relative longitudinal displacement of the side frames from normal position does not uniformly increase as the displacement of the side frames proceeds, but increases at a progressively changing rate, which rate of change may advantageously be uniform or substantially so. The resistance offered by the spring means to the initial displacement of either of the side frames from normal position preferably is comparatively lovv, While the resistance at the end of the displacement is preferably relatively high, the diagram of spring resistance being in theV form of a curve instead of a straight line.

lt is obvious that many changes may be made in the described embodiment of my improved truck Without departing from the spirit of my invention.

I claim y 1. In a car truck, the combination with side Vframe members` which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and means located intere mediate the ends of said side frame members and having a lchanging rate of resistance for yieldingly opposing relative longitudinal displacement of said side frame members from normal position.

2. 1n a car truck, the combination WithL side frame members which are relatively' movable longitudinally of the truck, of means extending transversely of said truck and adapted to connect the said side frame members, and spring means carried by said connecting means and adapted to be deflected by a longitudinal movement of either side frame member from normal position, said spring means also being adapted tovoffer resistance at an increasing rate to such longitudinal displacement of said side frame members.

3. 1n a car truck, the combination with side frame members Which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and means having an increasing rate of resistance for yieldingly opposing relative longitudinal displacement of said side frame members from normal position.

4l. ln a car truck, the combination With side frame members which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and means having a uniformly increasing rate of resistance for yieldingly opposing relative longitudinal displacement of said side frame members from normal position. Y

5. ln a car truck, the combination with side frame members which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and means having an increasing rate of resistance for yieldingly opposing relative longitudinal displacement of said side frame members, the resistance afforded by sai-d last named means being active to oppose relative longitudinal displacement of said side frame members from normal position at all stages of such displacement.

6. lin a car truck, the combination with side frame members which are relatively movable longitudinally of the truck, of a spring plank for connecting said side frame members, and yielding means mounted upon said spring plank and bearing against one of said side frame members for resisting a displacement ofeither of said side frame members from normal, said means being adapted to offer a low resistance to initial displacement of either of said frame mem-4- bers and to ai'ford a resistance of progres' sively increasing rate opposing relative longitudinal displacement of said side frame members from normal position.

7. lin a ear truck, the combmation with side frame members which are relatively movable longitudinally of the truck, of a transversely extending member adapted to connect the said side frame members, and leaf springs mounted on opposite sides of said transversely extending member and respectively operating upon an adjacent side frame member for yieldingly opposing a relative longitudinal displacement of said side frame members from normal position.

8. In a car truck, the combination with sideframe members which are relatively movable longitudinally of the truck, of a spring plank pivotally connected to said side frame members, and leaf springs rigidly secured to the opposite sides of said spring plank and each adapted to engage the adjacent side frame member for yieldingly resisting a relative longitudinal displacement of said frame members from normal position.

9. In a car truck, the combination with a pair of spaced side frame members which are relatively movable longitudinally of the truck, of a flanged spring plank pivotally connected at its opposite ends to said side frame members, and springs eacli of which is secured at one end to one of the flanges of said spring plank and bears at its opposite end against the adjacent side frame member, said springs being adapted yieldingly to resist a 'relative displacement of said side frame members from normal position.

10. In a car truck, the combination with side frame members which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and yielding means involving a plurality of springs adjacent to and.

cooperating With one of Said side frame members and adapted to be dissimultaneously energized upon longitudinal movements of said side frame in opposite directions from its normal position. l

In testimony whereof I affix my signature.

GSTAF ARVID ANDERSON. 

